A multiphasic method of contraception provides for sequentially administering to a female of child bearing age: (a) a Phase I composition containing a progestogen and an estrogen for about 4 to about 7 days； (b) a Phase II composition containing a progestogen and an estrogen for about 8 to about 16 days； (c) a Phase III composition containing a progestogen and an estrogen for about 4 to about 7 days； and (d) optionally, a Phase IV composition which is a placebo or a non-steroidal component, wherein the ethinyl estradiol equivalent amount of estrogen in the Phase II composition is at least 5 mcg greater than the ethinyl estradiol equivalent amount of estrogen in each of the Phase I and III compositions. Preferably the sequential administration is repeated the day following the completion of the administration of the Phase III compositions providing an extended cycle multiphasic oral contraceptive method.
